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Viability of L. delbrueckii subsp. bulgaricus strains 546 (○), V5221 (□), and V5242 (▵) during heat shock at 65°C. Exponential-phase cells were centrifuged, recovered in MPL medium, and incubated at 65°C. Each point is the average of at least five independent experiments. Standard deviations are shown by bars.
